The Dewey Decimal Classification System is the system which you most likely are familiar with, as it is the classification scheme most widely used by schools and public libraries.
Revamped by Will Ferrall
2
Performing Research
Understanding the Dewey Decimal Classification System
 
Otterbein's library uses the Dewey Decimal System to classify works in the Juvenile and Curriculum section (located on the lower level in Sarah's Corner). See the table below for the various subject areas covered by the System.
000
Generalities Librarians hard at work applying the Dewey Decimal System to their books.
100
Philosophy, Psychology
200
Religion
300
Social Sciences
400
Language
500
Natural Science, Mathematics
600
Technology (Applied Science)
700
Fine & Decorative Arts
800
Literature
900
Geography, History

EXAMPLE 1: JF B3456t

JF indicates juvenile fiction and then uses a letter and numbers to allow arrangement by author's last name.
JF
B
3456
t
Juvenile Fiction
Author's last name starts with B
Title starts with T
EXAMPLE 2: J 973.1 P23d
J or the word Juvenile indicate juvenile non-fiction and then uses the Dewey Decimal number which relates to the subject.
J
973.1
P
23
d
Juvenile non-fiction
US History (see table of subjects, listed above)
Author's last name starts with P
Title starts with D

EXAMPLE 3: Text 372.7 P745t

Curriculum materials may have the words Text or Text Kit written above their call numbers (in OPAL they are indicated with the location Curriculum). The call number, written on the books, includes the Dewey numbers for educational materials (372.7 or 372.8, etc.)
Text
372.7
P
745
t
Textbook
Educational material (see table of subjects, listed above)
publishing company begins with P
Author's last name begins with T (sometimes it is the title that begins with T)
If confusion still inhabits your mind, here are some helpful examples.
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